Expansion-pulley.



PATENTED NOV. 26, 1907.

Nol 872,282.

G. F. GEB. EXPANSION PULLEY. APPLIoATIoN FILED mm1, 120s.

nu cc.. wAsmNAa V the hub 12 of which is journaled loosely on vdirection of its axis and which serves as a PATENT OFFICE.

GEORGE F. GEB, OF FRANKLIN, MASSACHUSETTS.

EXPANSION-PULLEY.

No. 872,282. Specification of Application filed vFebruary 1 To all whom it may concern.'

Be it known that I, GEORGE F. GEB, of Franklin, in the county of Norfolk and State of Massachusetts, have invented certain new and useful Improvements in Expansion-Pulleys, of which the following is a specification.

This invention has relation to expansible pulleys, in which the belt receiving portion or eriphery of the pulley is divided into radially adjustable segments.

The object of the invention is to provide certain improvements in pulleys of this character, which are illustrated upon the accompanying drawings, described in the following specification and pointed out in the appended claims.

Referring to the drawings,-Figure 1 shows in front elevation a pulley provided with my improvements. Fig. 2 represents a side elevation of the same. Fig. 3 represents a section on the line 3 3 of Fig. 2. Fig. 4 re resents a section on the line 4-4 of Fig. 1. ig. 5 represents in detail one of the segments or sections of the pulley.

On'the said drawings, 10 indicates a stationary or non-rotatable shaft or arbor which is supported b any convenient means on the machine o which the pulley is to form a part. The pulley, which is loosely journaled upon this arbor, comprises a disk 11,

the arbor 10. Upon the said hub 12 is secured a gear 13 or other power transmitting member by which the rotation of the pulley is transmitted to some operative portion of the machine. The disk 11 is provided with an annular flange 14 which extends in the guide for a plurality of arms 15 which are arranged radially with relation to said flange 14 and arbor 10, and which carry on their outer ends segments 16 forming the belt-receiving portion of the ulley. The segments 16 bear at the inner ec ges against the outer face of the disk 11, so that, although they are adjustably radial of the arbor 10, nevertheless they are held against independent rotation. To eHect the radial adjustment of said segments simultaneously, I employ a member 17, having a series of iingers 1S, all arranged at equal acute angles to the axis of the arbor Letters Patent.

,1906. Serial No. 298952.

Patented Nov. 26, 1907.

is loosely journaled on the arbor 10 and is provided with an elongated hub 19, between the inner end of which and the outer face of the disk 11 is a coiled expansion spring 20.

The member 17 is preferably of cast metal, whereas the Ylingers 13 are formed of rods, about the ends of which the said member 17 is cast in its formation. The said rods or lingers 18 are supported only at their outer ends, their inner ends being free, whereby they may be inserted into inclined apertures 21 in the bars or arms 15. Each finger' 1S therefore constitutes as it were a wedge, so that, when the member 17 is adjusted in the direction of the axis of the arbor 10, it will move one of the pulley sections radially outward or inward as the case may be. The outer end of the arbor 10 is threaded to receive a hand nut 22, the inner end of which bears against the outer face of the member 17. The spring 20, which bears against the end 19 of the member 17, holds it against the nut so that, by rotating said nut in one direction or the other, the member 17 with its inclined fingers 18, may be adjustedoutward or inward as desired. In connection with the nut 22, I may use a lock-nut (not shown) if desired.

A decided feature of advantage of the device thus described as embodying the invention is, that the segments 16 are adjusted positively outward or inward by the axial movement of the member 17; andthe lingers 18, being engaged directly with the bars 15, hold said bars in any position to which they may be adjusted. Again, inasmuch as the inner ends of the 'lingers are free, the member 17 carrying the lingers may be easily removed and disengaged from the pulley sections so as to permit of their being cleaned or repaired and the partsmay be reassembled with facility.

I-Iaving thus explained the nature of the invention, and described a way of constructing and using the same, although without attempting to set forth all of the forms in which it may be made, or all of the modes of its use, I declare that what I claim is:

An expansion pulley, comprising a plurality of pulley sections, each having a radially arranged arm and .a segment at the end 10. j The member 17 consists of a disk which thereof, a disk having an annular flange apertured to receive and guide said arms, an threaded on said arbor for eecting an axial arbor on Which said disk is journaled, and adjustment of said member. 10 means for eiecting a radial adjustment of In testimony whereof I have aEXed my said sections consisting of an axially sliding I signature, in presence of tWo Witnesses. member having a series of fingers arranged GEORGE F. GEB.. at an inclination to the axis of said pulley, Witnesses: the free ends of said ingers being inserted in GEO. L. VESIR, v inclined apertures in said arms, and a nut WILLIAM A. WYOKOFF. --M 

